div div:hover{
	z-index:100;
	border-color:red;
}
div div {
	text-align:center;
	line-height:50px;
	width:50px;
	height:50px;
	border:5px solid blue;
	position: absolute;
}
body>div {
	background-color:rgb(209, 234, 238);
	display:inline-block;
}
